3.3 Amplitude, frequency, wavelength and period of wave

Frequency: the number of wave cycles in a second (measured in hz)

Period of a wave: the time it takes a wave to complete a wave cycle.

Frequency = 1/Period of wave

A wave cycle is a full wavelength.

See this image: http://www.bbc.co.uk/staticarchive/df504ecc44f0690dc88a53b7532182d8dc2e80ba.gif